链表 随机指针 复制

//链表 随机指针 复制
#include<iostream>
#include<ctime>
#include<vector>
#include<cstdlib>
using namespace std;
class CNode
{
public:
	int value;
	CNode* next;
	CNode* rand;
	CNode(int v);
	~CNode();
};
CNode::CNode(int v):value(v),next(0),rand(0){}
CNode::~CNode()
{
	cout<<"~CNode()"<<endl;
}
void buildRand(CNode* clink)
{
	int lenOfclink=0;//计算clink的长度
	vector<CNode*> vc;//并记录指针
	CNode* p=clink;
	while(p)
	{
		vc.push_back(p);
		p=p->next;
		lenOfclink++;
	}
	//长度为1
	if(lenOfclink==1)
	{
		clink->rand=clink;
		return;
	}
	else
	{
		p=clink;
		while(p)
		{
			p->rand=vc[rand()%lenOfclink];
			p=p->next;
		}
	}
}
void append(CNode* clink,int v)
{
	CNode* p=clink;
	while(1)
	{
		if(p->next==0)
		{
			p->next=new CNode(v);
			break;
		}
		else
		{
			p=p->next;
		}
	}
	
}
void print(CNode* clink)
{
	CNode* p=clink;
	while(p)
	{
		cout<<"p->value:"<<p->value<<"\n";
		if(p->next)
		{
			cout<<"p->next->value:"<<p->next->value<<"\tp->rand->value:"<<p->rand->value<<endl;
			p=p->next;
		}
		else
		{
			break;
		}
	}
}
void copyLink(CNode* src,CNode* &des)
{
	CNode* p=src,*temp;
	//复制双份src
	while(p)
	{
		temp=p->next;
		//复制一个p
		p->next=new CNode(p->value);
		p->next->next=temp;
		p=temp;
	}
	//复制rand
	p=src;
	while(p)
	{
		p->next->rand=p->rand->next;
		p=p->next->next;
	}
	//分离
	des=src->next;
	p=src;
	while(p)
	{
		temp=p->next;
		p->next=p->next->next;
		if(temp->next)
			temp->next=temp->next->next;
		p=p->next;
	}
}
int main(int args,char* argv[])
{
	//播种
	srand(time(0));

	CNode* clink=new CNode(1);
	append(clink,2);
	append(clink,3);
	append(clink,4);
	append(clink,5);
	buildRand(clink);
	print(clink);

	cout<<endl<<endl;

	CNode* des=0;
	copyLink(clink,des);
	print(des);

	return 0;
}